SC, is the reference stick a meter stick? Do you know the Archaeologists work? Each one has his own reference stick for photos. I always had both a CM and an inch stick for photo references.
It appears to be something of a known length that shows up well in photos, probably the excavator uses it all the time.
https://archaeology.org/wp-content/uploads/2025/08/News-20250821-Hippos-Mosaic-1.jpg
Common sense! Even a Coke can would be helpful. It is just beautiful, and such an important image deserves clarity.
